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The efficient markets hypothesis (EMH) is one of the more controversial theories on how the financial markets work. Popularized by Nobel-prize winning economist Eugene Fama, the EMH basically argues that all available information at any given time is priced into the market. And therefore, it's almost impossible to try to invest in a way to beat the market. Folks like Vanguard's Jack Bogle and Nobel-prize winning economist Robert Shiller disagree with the EMH because it essentially denies the existence of asset bubbles. With high-priced momentum stocks like Twitter and Groupon crashing
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